Perforated combustion-section for blue-flame stoves



H. RUPPEL.- PERFORMED COMBUSTION SECTION FOB BLUE FLAME STOVES. APPLICATION FILED mus. 1919.

1,333,577. Q Patented Mar. 9,1920.

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UNITED sTATEs PATENT oF ioE.

HENRY RUIPEL, or CLEVELAND, oniro, AssIeNoR To AMERICAN sTovn COMPANY, on

ST. LOUIS, MISSOURI, A conronarion on NEW JERSEY.

PERFORATED COMBUSTION-SECTION FOR BLUE-FLAME STQVESJ Specification of Letters Patent.

Application filed April 25, 1919. Serial No. 292,680. 7

reference being had therein tothe accom-' panying drawing. I

Th1s invention relates to improvements 1n perforated combustion sections for blue flame stoves, of that type in which the combustion tubes are parallel, forming a combinecl.fiame,and air and vapor mixing space between them. i p

" This type of burner is well known 'to those skilled in the art, and in which the vapor is generated from a wick or trough between the two perforated tubes ofthe section and at their lower ends, air passing into this'space through openings formed in the two tubes and mixesswith the vaporto support combustion, the combustion and mixing continuing throughout the space between the tubes, and finally issuing from between their upper ends'in a blue smokeless flame. One object of my present inventionis to provide an improved way of limiting the amount of air passing through the upper end'of' the inner combustion tube into the space between the two tubes.

Another object of my present invention is to have the air restricting means perform the double functions of restricting the air and lengthening the life of the inner tube by preventing the intense heat from warping the tube and burning it out.

A further object of my present invention is to provide the outer combustion tubewith an air restricting member located between its ends and .just below the air restricting member of the inner tube, whereby the two tubes are kept cooler by having the heavy combustion atthe lower portion of the inner f tube, and then shifting it to the upper portion of the outer tube, the restricting mem-' ber of: the outer tube serving to lengthen the life of the outer tubeby" preventing it from warping and burning out'as quickly as it otherwise does.

In the accompanying drawings Figure 1 is a vertical longitudinal sectional view through a perforated combustion section embodying my invention.

Fig. 2 is anenlarged side view of a part of one of the combustion sections, showing in exaggeration the large openings in the tube and the small openings in the air restricting member.

It is well known to those skilled in this art,that in the type of burner to which my improved combustion section is applied, vapor is generated between the outer tube 1 and the inner tube 2' of the combustion section, and that the vaporis generated either from a wick or trough. As the vapor passes up between the two tubes, air passes in through the large perforations 3 of the outer tube and. the large perforations 1 of the inner tube and mixes with the'vapor. The air mingles with the vapor and maintains the combustion, and this mingling and combustion continue throughout the space between the tubes, finally issuing between their upper ends in a smokeless bluefiame. In this type of combustion section, it has been found necessaryto restrict the amount of air passing between the tubes beginning a short distance above the lower ends of the tubes. This has been done in some instances by reducing the. number and size of the openings in the inner tube, as shown in my Patent No. 576,229 of February 2nd, 1897, or by perforated diaphragms located within the'inner tube, of which an illustration is found in the Patent No. 607 ,641, July 19th, 1898, granted to A. J. Blackford.

The best results have been found'to require a relative maximum amount of air through both the inner and outer tubes at Patented ivraa'aioeo.

their lower ends, and from that point up a relatively restricted amount of air supplied between the two tubes. This, 'as above stated, has been accomplished by either diaphragms alone, as in the Blackford patent, or by reducing the number'of openings in the inner tube, as in the Ruppel patent referred to, or by combining the perforated diaphragm and the reduced size of the openings, as in my Patent No, 616,425,, "of De cember 20th, 1898,.

In these prior constructions of combustion sections, they are single wall tubes and have been relatively short lived by reason of overheating, causing a warping and burning out of the tubes.

The} principal object of my present ini provement is to lengthen the life of the combustion section, and this is done in my present improvement in twoways:

First, by shifting the heavy combustion from the intermediate portion of the outer tube to the corresponding portion of the inner tube, and then shifting the hca y combustion from the upper part of the inner tube to the upper part of the outer tube, by first causing less air to pass through the intern'iediate portion of the outer tube than passes through the 7 corresponding portion of the inner tube, and second, by having less air pass through the uppe portion of the inner tube than passes through the corresponding portion of the outer tube.

Second, by having he restricting memher in the form of an auxiliary wall applied to the proper parts of the device, the auxiliary wall having openings registering hvith, but smaller than the openings in the wall of the tube. This gives additional thickness to the wall of the tube where it is applied, affording greater strength to prevent warping of thetube and to prevent it from becoming so intensely hot. I

My improvement consists in having the auxiliary wall 4 applied to the outer tube 1, and provided with openings '5, which register with, but arelsmaller than the openings 3 of the outer tube, thus restricting the amount of air passing into the combustion and mixing space A, between the two tubes throughout the length of the auxiliary wall. This wall is attached to the tube 1 in any desired manner, but, preferably, by the well known methodof electric spot welding.

My improved air restricting auxiliary wall 6, is applied to the inner tube 2, and with its lower end 7 preferably beginning at or approximatelyin a horizontal line with the upper end of the auxiliary perforated wall 4 of the outer tube and extending to the top of the inner tube. This auxiliary wall 6 is provided with air openings 8, which. register with but are smaller than the openings 4 of the inner tube, and it too is attached to the inner tube preferably by electric spot weldin WVith this arrangement of auxiliary walls,

7 the maximum amount of air passes to the fiamespace A at the lower ends of the combustion tubes where it is needed. At this point the combustion for both tubesis substantially equal. The auxiliary wall a cuts down the amount of air passing into the flame space by having the smaller openings 5, and so faras the airsupply is concerned, it performs the function-of the lower dia thinner than the wall of the inner and outer tubes to which they are applied. The reason for this is two-fold, one being to prevent a heavy wall which would be obj ectionablc. and the other being that it is not practical to punch small holes in a sheet as heavy as that of which the inner and outer tubes are composed.

\Vhile I have shown and prefer to have the restricting auxiliary walls 4: and 6 on the inner sides of the inner and outer tubes. I desire it to be understood that the auxiliary walls may be placed on the outer sides of the tubes; 1

Having thus described my invention, what I claim and desire to secure by Letters Patent is 1. A combustion section comprising parallel inner and outer perforated tubes, the inner tube having an auxiliary perforated wall tightly fitting it and having perforations registeringwith but smaller than the perforations of the tube, for the purpose described. V

2. An improved combustion. section comprising parallel inner and outer perforated tubes, the inner tube having an auxiliary wall tightly fitting its upper end and having openings registering with but smaller than the openings of the tube, for the purpose described.

3. An improved combustion section, comprising inner and outer .parallelperforated tubes, the inner tube having an auxiliary wall tightly fitting the inner side of its upper end and having openings registering with but smaller than theopenings of the tube, for the purpose described.

4. A combustion" section comprising inner and outer parallel perforated tubes, the inner tube having an auxiliary wall applied thereto and having openings registering with but smaller than the openings of the tube, and the outer perforated tube having an auxiliary wall applied thereto and having openings registering with'but smaller than the openings of the tube, the auxiliary wall of the outer tube located below the auxiliary wall of the innertube.

5. An improved combustion section comprising inner and outer perforated parallel tubes, the inner tube having an auxiliary wall applied thereto and provided with openings registering with but smaller than the openings of the tube, the outer tube below the auxiliary wall of the inner tube and having openings registering with but smaller than the openings of the outer tube and its lower end located above the lower ends of the two tubes, the parts combined for the purpose described. a

6. An improved combustion section comprisinginner and outer perforated parallel tubes, said tubes having longitudinally extending air restricting members located in,

different horizontal planes with the lower end of the lowest restricting member located above the lower ends of the tubes, whereby the lower ends of both tubes are subjected to substantially uniform combustion and the combustion thereabove shifted from one tube to the other, for the purpose described. 7. An improved combustion section comprising inner and outer perforated parallel tubes, the outer tube having a longitudinal air restricting member for shifting the heavy combustion to the inner tube, and the inner tube having a longitudinally extending air restricting member above the air restrictive member of the outer tube, whereby the heavy combustion is shifted to the upper end of the outer tube for the purpose described.

8. An im roved combustion section of the type described, comprising parallel inner and outer perforated tubes, the inner tube having relatively smaller perforations at its upper portion than at its lower portion, and the outer tube having air-passages at its upper portion larger than the small airpassages of the inner tube, and the outer tube having also relatively small air-passages below its large air-passages and in a horizontal plane with the large air-passages of the lower portion of the inner tube, for the purpose described. 1

9. An improved combustion section, comprising inner and outer parallel perforated tubes, the inner tube having at its upper end a longitudinally extending air restricting member, and the outer tube having a longitudinally extending air-restricting member having its lower end above the lower end of the tube and its upper end approximately in a horizontal line with the lower end of the air-restricting element of the inner tube, for the purpose described.

In testimony whereof I hereunto afiix my signature.

HENRY RUPPEL. 

